US5038065A - Permanent magnet reversible synchronous motor - Google Patents

Permanent magnet reversible synchronous motor Download PDF

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Publication number
US5038065A
US5038065A US07/349,494 US34949489A US5038065A US 5038065 A US5038065 A US 5038065A US 34949489 A US34949489 A US 34949489A US 5038065 A US5038065 A US 5038065A
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Prior art keywords
rotor
permanent magnets
stator
projecting portions
rotor core
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Expired - Lifetime
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US07/349,494
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English (en)
Inventor
Jun Matsubayashi
Fumio Tajima
Kunio Miyashita
Kazuaki Takada
Kuniaki Kubokura
Eiji Toyoda
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Hitachi Taga Engineering Co Ltd
Hitachi Ltd
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Hitachi Taga Engineering Co Ltd
Hitachi Ltd
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Assigned to HITACHI, LTD., HITACHI TAGA ENGINEERING, LTD. reassignment HITACHI, LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KUBOKURA, KUNIAKI, MATSUBAYASHI, JUN, MIYASHITA, KUNIO, TAJIMA, FUMIO, TAKADA, KAZUAKI, TOYODA, EIJI
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors

Definitions

  • the present invention relates to a permanent magnet type synchronous motor, and more particularly to a permanent magnet type synchronous motor which has a rotor with projecting poles suitable for reducing the electric current used when the motor is accelerated or decelerated, and which is suitable to obtain low cogging torque.
  • FIG. 1 shows a permanent magnet type synchronous motor 1 (which will hereinafter be referred to as motor), magnetic pole sensor 2 adapted to detect the magnetic pole position of the motor 1, encoder 3 adapted to detect the rotational speed and direction of the motor 1, driving circuit 4 for the motor 1, which normally works as an inverter driving circuit and is driven by a normal rotation instruction 13 or a reverse rotation instruction 14 from a speed-position control circuit 5, operational speed instruction circuit 6, sewing machine 7 constituting a load, needle position sensor 8 for the sewing machine 7 which is adapted to normally detect two positions, i.e.
  • a signal processing circuit 9 adapted to determine the rotational speed (revolution numbers) in the normal rotational and reverse rotational directions on the basis of a detected original signal from the encoder 3 and output a signal to the speed-position control circuit 5, and a sewing machine control circuit 10 associated with the function of the sewing machine and adapted to drive the sewing machine 7 in accordance with a signal from a sewing machine operating instruction circuit 11 which is energized by a sewing command signal from an operator.
  • the motor 1 and sewing machine 7 are connected together by a belt, and this motor 1 is of a 120° feed PWM voltage control system.
  • Reference numeral 12 denotes a belt connecting the motor 1 and sewing machine 7 together.
  • a signal is sent from the sewing machine control circuit 10 to the speed-position control circuit 5 so as to operate the motor 1 in accordance with the speed command.
  • the speed-position control circuit 5 selects at the acceleration time a normal rotational mode on the basis of an operation command signal to accelerate the motor 1 by the driving circuit 4 at a voltage command level which is 120° feed pulse width controlled, and enter into a steady operation.
  • a stator winding to which an electric current is to be selectively applied is determined by processing a signal from the magnetic pole sensor 2 by the speed-position control circuit 5, and a plurality of selected transistors in the inverter are turned on in accordance with a signal from this circuit 5, so that a winding current flows.
  • a signal obtained from the encoder 3 and representative of an actual speed of the motor 1 is fe back to the speed-position control circuit 5 and sewing machine control circuit 10, and the operational speed is in agreement with this signal and a speed command applied from the operational speed instruction circuit 6 to the control circuit 5 by a foot pedal (not shown).
  • a machine operated in this manner must carry out several-switch sewing operations with a high frequency.
  • a motor used in a sewing machine is thus started and stopped very often, so that a large current flows therethrough every time the motor is started and stopped.
  • Industrial sewing machines and Factory Automation Robots are required to start and stop high frequently. Since large torque is required and feed current becomes large in this type sewing machine at the time of acceleration or deceleration of the motor as disclosed in FIG. 2, the temperature of the motor 1, the driving circuit 4 and other constituting elements rise remarkably during the operation of these elements so that these elements are required to have large capacity for avoiding the temperature rising of these elements.
  • FIG. 3 shows torque characteristics of a rotational phase of a permanent magnet type synchronous motor of a 120° electric PWM voltage control system which has protruded iron cores between the poles of permanent magnets of the rotor.
  • the solid line shows a torque characteristic of a conventional permanent magnet type synchronous motor which does not have the protruded iron cores among the poles of permanent magnets of the rotor
  • the dotted line shows a permanent magnet type synchronous motor of the present invention which has protruded iron cores (projecting poles) therebetween.
  • the permanent magnet type synchronous motor of the present invention having the projecting poles generates a large torque compared with the conventional permanent magnet type synchronous motor which lacks the projecting poles under the same applied current.
  • a motor torque ( ⁇ torque) in the normal rotation region or in a state of braking in which the motor is changed from the reverse rotation region to the normal rotation region, is delayed in phase by ⁇ ° compared with that of the conventional motor as can be seen in the large torque generation portion from (30°+ ⁇ °) to (30°+ ⁇ °)+(30°) in FIG. 3.
  • ⁇ torque Another motor torque ( ⁇ torque) in the reverse rotation region or in another state of braking in which the motor is changed from the reverse rotation region to the normal rotation region, is advanced by a phase ⁇ compared with that of the conventional motor as disclosed in another large torque generation portion from ⁇ (180°)-(30°- ⁇ °)-(30°) ⁇ to ⁇ (180°-(30°- ⁇ °) ⁇ in FIG. 3.
  • the conventional permanent magnet type synchronous motor which lacks the projecting poles has a drawback in that a large torque can not be attained.
  • the above-mentioned prior publications do not discuss this point.
  • reference numeral 101 denotes a rotor as a whole, 102 a permanent magnet fixed to the outer circumferential portion of a rotor core 103, and 104 a detecting magnet adapted to determine a commutating period of a stator winding (not shown) and fixed to a motor shaft 105.
  • the permanent magnet 102 is divided into four equal parts which are bonded to the outer circumferential surface of the rotor core 103 with a bonding agent.
  • the permanent magnets 102 may also be held on the outer circumferential surface of the rotor core 103 by a small-thickness cylindrical member of stainless steel. If both the bonding agent and cylindrical member are used, the permanent magnets can be fixed to the rotor core more firmly.
  • the prior art detecting magnets 104 comprising a metal magnetized body are arranged in same angle and same polarity as the permanent magnets 102 facing to the side surface of the permanent magnets 102. If three phases are used for the stator coils, three magnetic pole detecting elements 30 are necessary on the magnetic pole sensor 2 as disclosed in FIG. 6.
  • a rotor in a conventional motor of this kind is constructed as shown in FIG. 4.
  • the synchronous motor in which this problem is solved that is to increase the torque are the synchronous motors disclosed in the previously-mentioned laid-open publications. However, even in these synchronous motors, for example, the reduction of cogging torque is not considered.
  • a first object of the present invention is to provide a permanent magnet type synchronous motor which is able to increase the reluctance torque and decrease the cogging torque of the motor.
  • a second object of the present invention is to provide a permanent magnet type synchronous motor which is able to utilize greatly improved reluctance torque in both normal rotation and reverse rotation of the motor.
  • a third object of the present invention is to provide a permanent magnet type synchronous motor which is able to provide simple magnet holding structures.
  • the first object mentioned above of increasing the reluctance torque and reducing the cogging torque can be achieved by a permanent magnet type synchronous motor having a stator provided with a plurality of slots, and a rotor disposed close to and in opposition to the stator so that the rotor can be rotated, the rotor consisting of a rotor core mounted fixedly on a motor shaft, and an even number of permanent magnets provided on a circumferential portion of the rotor core, characterized in that the rotor core has projecting portions among the permanent magnets, the width of each of the projecting portions being set different from the pitch of the slots in the stator.
  • the second object mentioned above of utilizing the reluctance torque can be achieved by a permanent magnet type synchronous motor having a stator provided with a plurality of slots, and a rotor disposed close to and in opposition to the stator so that the rotor can be rotated, the rotor consisting of a rotor core mounted fixedly on a motor shaft, and an even-numbered permanent magnets provided on a circumferential portion of the rotor core, the stator having detectors for determining the positions of the permanent magnets on the rotor, characterized in that the position detectors consist of two sets of position detectors, i.e.
  • the two sets of position detectors comprise the detectors for the normal rotation and the reverse rotation, the corresponding two sets of position detecting signals of either ⁇ torque or ⁇ torque concerning FIG. 3 explained before, have to be proceeded in a pattern generating circuit for discriminating these signals into the normal rotation signal at normal rotation and the reverse rotation signal at reverse rotation in a pattern generating circuit as explained later to operate the driving circuit correctly in the normal rotation and reverse rotation, respectively, using the projecting poles such as shown in FIG. 7, generating a large torque and shifting the phase as shown in FIG. 3 compared with the conventional motor shown in FIG. 5.
  • the third object of providing simple magnet holding structures can be achieved by a permanent magnet type synchronous motor having a stator provided with a plurality of slots, and a rotor disposed close to and in opposition to the stator so that the rotor can be rotated, the rotor consisting of a rotor core mounted fixedly on a motor shaft, and an even-numbered permanent magnets provided on a circumferential portion of the motor core, characterized in that the rotor core has protruded portions among the permanent magnets, members for holding the permanent magnets being provided at the free ends of the protruded portions.
  • phase difference explained above is proportional to the commutating current.
  • An effectual normal or reverse rotational operation can be performed by detecting the phase difference previously and commutating the current to the stator by shifting an input signal to the driving circuit corresponding to the rotational magnetic pole detecting signal and the normal or reverse operating instruction.
  • the magnet holding members, parts of the projecting portions work so as to press the magnets from the outside. Therefore, it becomes unnecessary to prepare any other magnet holding parts separately, and this enables the construction of the motor to be simplified.
  • FIG. 1 illustrates a block diagram for explaining a control method of a prior permanent magnet type synchronous motor
  • FIG. 2 is a diagram for explaining an operational condition of the prior permanent magnet type synchronous motor shown in FIG. 1;
  • FIG. 3 shows a relation between rotational angle and torque in one phase of the prior permanent magnet type synchronous motor and one embodiment of the present invention
  • FIG. 4 illustrates a positional relationship between the rotor and the magnetic pole sensor
  • FIG. 5 shows a sectional view along A--A line shown in FIG. 4;
  • FIG. 6 illustrates a plane view of a conventional magnetic pole sensor
  • FIG. 7 shows a plane view of a rotor showing one embodiment of the present invention
  • FIG. 8 shows a relation between motor speed and current in the embodiment of the present invention.
  • FIG. 9 shows a characteristic comparison diagram between the motor of the present invention having the projecting poles and the prior art having no projecting poles;
  • FIG. 10 illustrates a condition of occurrence of a cogging torque
  • FIG. 11 is a graph showing a relation between the width of a projecting pole and cogging torque
  • FIG. 12 is a front elevation showing magnet holding members provided on the protruded portions
  • FIG. 13 is a construction diagram of a modified rotor also having magnet holding members
  • FIG. 14 is a diagram showing the relation between a detecting magnet and the magnetic pole sensors
  • FIG. 15 is a connecting diagram of a conventional position detector
  • FIG. 16 is a connecting diagram of position detector applied to the present invention.
  • FIG. 17 is a modified embodiment shown in FIG. 14;
  • FIG. 18 is a diagram showing one embodiment of the magnetic pole sensor in which normal rotation sensors and reverse rotation sensors are provided;
  • FIG. 19 is a modified embodiment shown in FIG. 18.
  • FIG. 20 is a graph showing a relation between a torque constant and a feed current.
  • FIG. 21 illustrates a block diagram in which the present invention is applied.
  • projecting portions 103A formed by projecting parts, or to be exact, four parts, of the outer circumferential region of a rotor 103 consisting of a material of a high magnetic permeability are interposed among permanent magnets 102.
  • the outer circumferential surfaces of the projecting portions 103A are flush with those of the permanent magnets 102.
  • the projecting portions 103A consist of laminated silicon steel plates, the same material as that of the rotor core 103, the magnetic permeability thereof is higher than that of the permanent magnets 102.
  • FIG. 8 shows the relation between the motor speed and electric current.
  • FIG. 9 is a comparative characteristic diagram showing the relation between the torque and the electric current of the conventional motor shown by the solid line 16 and the motor of the present invention shown by the dotted line 17, and showing the relation between the torque and number of revolutions per minute of the conventional motor shown by the solid line 18 and the motor of the present invention shown by the dotted line 19.
  • the projecting portions 103A of the present invention shown in FIG. 7 have a magnetism collecting effect, so that the quantity of magnetic flux between the projecting portions 103A and stator when a large current is applied. Consequently, the present invention has such a result that the above-mentioned effect is especially great when a large current is applied.
  • torque is taken in the direction of the lateral axis, and electric current and number of revolutions per minute in the direction of the vertical axes, and it is clear from the drawing that the present invention is superior to the conventional motor as mentioned above.
  • the present invention is thus capable of greatly improving the torque characteristics displayed when a large current is applied.
  • the construction for reducing the cogging torque will now be described.
  • a projecting pole ratio i.e. a ratio of the angle of the projecting portion 103A to the sum of the angles of the permanent magnet 102 and projecting 103A decreases as A/C in FIG. 7 becomes large.
  • the number of occurrences of cogging torque per revolution of a magnet is determined fundamentally on the basis of the numbers of poles of a rotor and a stator. However, it is considered that this number of occurrence of cogging torque finally reaches a level corresponding to the number of the projecting poles of the stator, in view of a case where the numbers of the poles are the same, with one phase winding set around a plurality of projecting poles.
  • This cogging torque occurs in every fifteen, which is a quotient obtained by dividing one revolution (360°) by 24, degrees of movement of the rotor as shown in FIG. 10.
  • reference numeral 106 denotes a stator core, and 107 slots.
  • Reference letter B denotes a distance (angle) between two adjacent slots, i.e. the pitch of the slots.
  • the cogging torque occurs in the combination of the slots and the permanent magnets. In the B region shown in FIG. 7, the variation of the cogging torque grows frequently as shown in FIG. 10.
  • the problem of reduction of the magnetic flux density variation can be solved by setting different the pitch B of the slots and the angle A of a projecting portion 103A.
  • n is an integer not less than one.
  • the inventors of the present invention made experiments to determine the variation of cogging torque with respect to the ratio B/A to find out that the cogging torque and B/A ratio had the characteristics shown in FIG. 11.
  • the vertical axis of FIG. 11 represents the magnitude of cogging torque, and a base magnitude of 1.0 is the magnitude of cogging torque occurring in the rotor having no projecting portions shown in FIG. 5, the graduations on this axis being determined at a predetermined rate on the basis of the base magnitude.
  • the lateral axis of FIG. 11 represents a ratio of the pitch B of the slots to the angle A, i.e. B/A.
  • n is an integer.
  • the cogging torque cannot be reduced by merely arranging the projecting portions 103A among the permanent magnets 102.
  • the reduction of cogging torque cannot be effected unless the projecting portions 103A and slots are arranged so that the width of each projecting portion and the pitch B of the slots have predetermined relation.
  • the inventors of the present invention have ascertained that the cogging torque in the embodiment of the present invention decreases to 1/3-1/5 of that in a conventional motor of this kind by satisfying the above-mentioned formula (2).
  • a permanent magnet type synchronous motor of the present invention can be operated at a high speed or rotated at tens of thousands of times per minute compared with the conventional motor in this field, and the motor of the present invention can be extensively used. If the adhesion and bonding strength of the permanent magnets 102 and that of the rotor core are low, the permanent magnets fly off during a rotation of the motor to result in a grave accident.
  • the inventors discussed in various aspects a simple structure for improving the bonding strength of the permanent magnets 102 and the rotor core 103. Examples of this structure are shown in FIGS. 12 and 13. In the example of FIG.
  • the magnet holding members 103B are formed unitarily with the projecting portions 103A so as to extend in the circumferential direction of these projecting portions 103A.
  • Each of these magnet holding members 103B works literally so as to hold the magnets 102 on both sides thereof from the side of the outer circumferences thereof.
  • the distance between the rotor core 103 and a magnet holding member 103B, i.e. the radial size of a magnet retaining portion is set slightly larger than that of a permanent magnet 102, so that the magnets can be fixed to the rotor core more easily.
  • intervening members 108 consisting of a plastic, hard rubber or a spring material are inserted in the clearances between the permanent magnets 102 and magnet holding members 103B to complete the assembling of the rotor 101.
  • FIG. 13 shows a structure for combining permanent magnets 102 with a rotor core 103 without using the intervenient members 108 used in the example of FIG. 12.
  • reference numeral 103C denotes claws formed integrally with magnet holding members 103B.
  • the distance between the center of the rotor core and an end of a claw 103C is set slightly shorter than that between the center of the rotor core and the corresponding portion of the outer circumference of the relative permanent magnet 102.
  • the permanent magnets 102 are pressure-fitted in their axial direction into the rotor core 103 by utilizing the flexibility and elasticity of the rotor core 103, to complete the assembling of the rotor.
  • the sizes of the projecting pole portions 103A are set so as to reduce the cogging torque.
  • the size A of a projecting pole portion 103A is set equal to the width of a magnet holding member 103B.
  • the starting torque is improved greatly, and the cogging torque is reduced.
  • the permanent magnets can be fixed simply, and the bonding strength of the permanent magnets and rotor combined in the mentioned manner is also improved to a high degree.
  • the permanent magnet type motors having a rotor of the above-described construction can be divided into motors provided with a mechanical brush, and motors having no such brush, so-called brushless motors.
  • a brushless motor is adapted to be rotated by applying an electric current threto with the pole winding selectively shifted in accordance with the position of the rotor, and, therefore, it is essential that this motor be provided with a detector for determining the position of the rotor.
  • a position detector consists of a magnetic detecting element adapted to detect a permanent magnet 102 on the rotor 101.
  • the magnetic detecting element There are various kinds of elements used as the magnetic detecting element, which include generally used elements, such as a magnetic resistance effect element and a Hall IC.
  • FIG. 14 shows the arrangement of magnetic detecting elements of the present invention consisting of Hall IC's.
  • a set of Hall IC's consisting of three hatched 30°-shaped Hall IC's 30A, 30B, 30C are position sensors for the normal rotation of the rotor, and non-hatched Hall IC's 30D, 30E, 30F position sensors for the reverse rotation of the rotor.
  • the normal-rotation position sensor set are advanced from the center line by ⁇ °, and the reverse-rotation position sensor set are delayed from the center line by ⁇ °. Namely, the normal-rotation position sensor set and reverse-rotation position sensor set are arranged as they are staggered from each other by ⁇ + ⁇ (degrees).
  • reverse-rotation position sensor set are provided in addition to the normal-rotation position sensors used while the rotor is rotated normal, these reverse-rotation position sensors being arranged in a staggered manner with respect to the normal-rotation position sensors.
  • This quantity of stagger i.e. the angle ⁇ + ⁇ is, of course, set selectively to a suitable level so that the normal-rotation characteristics of the motor and the reverse-rotation characteristics thereof agree with each other. Therefore, when an apparatus shown in FIG. 21 is explained later is driven by the improved rotor shown in FIG. 7 and the magnetic pole sensor or the rotation position sensor 202 shown in FIG. 14, large increasing of the torque caused by the reluctance torque and decreasing of the cogging torque can be attained in normal and reverse rotation of the motor of the present invention.
  • a Hall IC has a three-terminal structure as shown in FIG. 15.
  • reference letters Vcc denotes a DC power source terminal
  • GND a ground terminal, an output corresponding to the variation of internal electric resistance due to the external magnetic field being outputted from an output terminal OUT.
  • a single Hall IC element usually has three terminals as mentioned above. Therefore, when six Hall IC's are provided as shown in FIG. 14, a total of eighteen terminals are required, so that the circuit becomes complicated.
  • a circuit solving this problem is shown in FIG. 16. As is clear from this drawing, the number of terminals (wires) is decreased to eight by using a DC power source terminal Vcc and a ground terminal GND in common. This enables the circuit to be simplified.
  • all Hall IC's be molded on a single substrate 40 as shown in FIG. 17. Namely, when a substrate is used in common, all (six) Hall IC's can be positioned by one regulating operation. This enables a Hall IC positioning operation to be simplified, and the element supporting strength to be improved, so that positioning sensors having excellent vibration resistance can be obtained.
  • FIGS. 18 and 19 correspond to FIGS. 14 and 17, respectively.
  • the difference between FIGS. 18, 19 and FIGS. 14, 17 is that the former constitutes the magnetic pole sensor by two sets of sensors of 202-1 and 202-2, and the latter constitutes the magnetic pole sensor by one set of sensor 202.
  • the starting torque 18 is comparatively small. If the projecting portions 103A shown in FIG. 7 are provided among the permanent magnets 102 as in the present invention, the starting torque is improved greatly owing to the magnetism collecting effect.
  • the relation between the conducting current to the stator and the torque constant is as follows.
  • the torque constant of the present invention which has the projecting poles 103
  • the torque constant becomes small as shown by the solid line 20 in FIG. 20.
  • the characteristic of the induced voltage constant of the conventional permanent magnet type synchronous motor decreases corresponding to the conducting current as shown by the solid line 20 in FIG. 20 based on an influence of the inductance of the stator.
  • the projecting poles as shown in FIG.
  • the output signal of the magnetic pole sensor 2 is inputted to the pattern generating circuit 18.
  • the output signal of the rotary encoder 3 is inputted to the four times frequency circuit 17.
  • the four times frequency circuit 17 is used for increasing the resolution in the speed-position control circuit 5 and the calculating circuit 16, a conventional frequency circuit can be used instead.
  • the calculating circuit 16 is used for calculating, for instance, a position of the reverse rotation sensor 30D based on another position of the normal rotation sensor 30A when the motor rotational direction is switched from the normal rotation to the reverse rotation.
  • the pattern generating circuit 18 is used for switching the start position of the motor.
  • the pattern generating circuit 18 when the motor rotational direction is switched from the normal rotation to the reverse rotation, the pattern generating circuit 18 outputs a control signal to the driving circuit 4 to start from 180°- ⁇ (30°- ⁇ °)+30° ⁇ to ⁇ 180°-(30°- ⁇ °) ⁇ of one phase, for instance, in U phase among three phase.
  • the pattern generating circuit 18 outputs another control signal to the driving circuit 4 to start from ⁇ 30°+ ⁇ ° ⁇ to ⁇ (30°+ ⁇ °)+30° ⁇ in one phase, for instance, in U phase among three phase.
  • the driving circuit 4 is driven by the control signal of the pattern generating circuit 18 and the pulse width modulation signal from the speed-position control circuit 5.
  • the conducting position of current to the stator is carried out by the pattern generating circuit 18. Since the rotational position of the motor can be known based on the calculating value of the rotary encoder 3 and the magnetic pole sensor 2, the conducting position of current to the stator can be decided by the rotational position.
  • the present invention can obtain a large torque in such a manner that the torque delayed by ⁇ ° is obtained compared with the conventional torque sensors shown in FIG. 6 in the normal rotation and the torque advanced by ⁇ ° is obtained compared with the conventional torque sensors in the reverse rotation by setting the magnetic pole sensors of the present invention as well as the conventional ones.
  • large torque constant can be obtained in normal and reverse rotation flowing large current to the stator and utilizing magnetizing effect of the armature reaction so that the characteristic shown by the dotted line in FIG. 9 can be obtained.
  • each of the projecting portions 103A is set so as to have predetermined relation with the pitch B of the slots, the cogging torque can be reduced greatly as shown in FIG. 11.
  • the motor to which the present invention is applied consists of a generally used rotary type motor, and the present invention can also be applied to a linear motor in the same manner.
  • parts of the rotary core are projected among the permanent magnets to form projecting portions in the mentioned positions, and the width of each projecting portion is set different from the pitch of the slots in the stator compared with the conventional motor which has not the projecting poles. Therefore, the torque at the starting time increases greatly, and the cogging torque decreases.
  • two sets of position detectors i.e. a normal-rotation position detector set and a reverse-rotation position detector set are provided, which are arranged with a phase difference set between the detector sets, so that the characteristics of the motor during the normal rotation period and reverse rotation period are all excellent, and scatter of the characteristics in these periods decreases to a low level.
  • parts of a rotary core are projected among the permanent magnets to form projecting portions in the mentioned positions, and members for holding the permanent magnets are formed at the ends of these projecting portions, so that the permanent magnets can be held by simply-constructed members.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Brushless Motors (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
US07/349,494 1988-05-13 1989-05-09 Permanent magnet reversible synchronous motor Expired - Lifetime US5038065A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63114697A JPH0755037B2 (ja) 1988-05-13 1988-05-13 永久磁石式同期電動機
JP63-114697 1988-05-13

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US5038065A true US5038065A (en) 1991-08-06

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US (1) US5038065A (de)
EP (1) EP0341630B1 (de)
JP (1) JPH0755037B2 (de)
CN (1) CN1017952B (de)
DE (1) DE68919898T2 (de)

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US5397951A (en) * 1991-11-29 1995-03-14 Fanuc Ltd. Rotor for a synchronous rotary machine
US5402049A (en) * 1992-12-18 1995-03-28 Georgia Tech Research Corporation System and method for controlling a variable reluctance spherical motor
US5410232A (en) * 1992-12-18 1995-04-25 Georgia Tech Research Corporation Spherical motor and method
US5604390A (en) * 1994-07-06 1997-02-18 U.S. Philips Corporation Permanent magnet motor with radically magnetized isotropic permanent magnet cylindrical yoke
US5631512A (en) * 1994-04-13 1997-05-20 Toyota Jidosha Kabushiki Kaisha Synchronous motor having magnetic poles of permanent magnet and magnetic poles of a soft magnetic material
WO1997048172A1 (en) * 1996-06-10 1997-12-18 Emerson Electric Co. Reluctance machine with permanent magnet rotor excitations
US5744894A (en) * 1995-10-26 1998-04-28 Dongyang Mechatronics Corporation Brushless motor having a field magnet, a portion of which is used for detecting the rotor's position
US5801470A (en) * 1996-12-19 1998-09-01 General Electric Company Rotors with retaining cylinders and reduced harmonic field effect losses
US5886440A (en) * 1994-05-02 1999-03-23 Aisin Aw Co., Ltd. Electric motor with plural rotor portions having pole members of different widths
US5936322A (en) * 1995-12-26 1999-08-10 Aisin Aw Co., Ltd. Permanent magnet type synchronous motor
US6008614A (en) * 1991-03-08 1999-12-28 Honda Giken Kogyo Kabushiki Kaisha Synchronous motor with permanent magnets and motor system
US6028377A (en) * 1997-04-07 2000-02-22 Japan Servo Co., Ltd. Three-phase permanent magnet cascade claw type stepping motor
US6144138A (en) * 1996-10-17 2000-11-07 Robert Bosch Gmbh Claw pole generator
US6166472A (en) * 1996-02-05 2000-12-26 Active Power, Inc. Airgap armature coils and electric machines using same
EP1139548A2 (de) * 2000-03-31 2001-10-04 Sanyo Denki Co., Ltd. Synchronmotor mit internem Dauermagnet
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US6552459B2 (en) * 2001-03-20 2003-04-22 Emerson Electric Co. Permanent magnet rotor design
US20020135253A1 (en) * 2001-03-22 2002-09-26 Tomy Sebastian Rotor assembly for variable torque constant brushless motors
US6703744B2 (en) * 2001-04-20 2004-03-09 Denso Corporation Generator-motor for vehicle
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US20060181172A1 (en) * 2003-07-18 2006-08-17 Shinya Naitou Rotary electrical machine and electric vehicle having the same
US20070170299A1 (en) * 2004-01-30 2007-07-26 Walter Ritter Drives pertaining to a reel changer
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US20170063204A1 (en) * 2014-02-24 2017-03-02 Lohr Electromecanique Synchronous machine provided with an angular position sensor
US10312774B2 (en) * 2014-02-24 2019-06-04 Lohr Electromecanique Synchronous machine provided with an angular position sensor
US20170082096A1 (en) * 2014-03-19 2017-03-23 Whirlpool S.A. Reciprocating Refrigeration Compressor and Method for Mounting a Reciprocating Refrigeration Compressor
US20180083556A1 (en) * 2015-04-06 2018-03-22 Lg Electronics Inc. Laundry treatment apparatus
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CN1037805A (zh) 1989-12-06
DE68919898D1 (de) 1995-01-26
DE68919898T2 (de) 1995-04-27
EP0341630A3 (en) 1990-07-04
JPH0755037B2 (ja) 1995-06-07
JPH01286758A (ja) 1989-11-17
EP0341630A2 (de) 1989-11-15
CN1017952B (zh) 1992-08-19
EP0341630B1 (de) 1994-12-14

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